Leroy Osmior Chronographe Monopoussoir Automatique (Automatic Single Push-button Chronograph)

The automatic single push-button chronograph in the Leroy Osmior line is an exclusive creation from the company’s watchmakers who drew their inspiration from exceptional timepieces in the brand’s private museum. Manufacturing chronographs has been a speciality of Leroy for almost a century and a half.

The company was the world’s first to develop and patent a chronograph capable of measuring time to one hundredth of a second and, a few years later, to one thousandth of a second.

Available in pink or white gold versions, and featuring an engine-turned dial, all OSMIOR single push-button chronographs are individually numbered. Each OSMIOR single push-button chronograph is delivered with their individual and official chronometer certificate delivered by the National Observatory of Besançon.

Technical details
Cal. L411.1
Diameter: 30.00 mm (13.3’’’)
Total thickness of the movement: 6.00 mm
Frequency: 28’800 vibrations per hour (4 Hz)
Jewels: 48 Rubies
Power reserve: exceeding 48 hours (double barrel)
Bridges finishing «Côtes de Genève»
Central rotor in 22 carat yellow gold with the heavy segment in 18 carat white gold
Chronometer officially certified by the National Observatory of Besançon

Case diameter: 41.00 mm
Total thickness of the watch: 11.70 mm
Water resistant to 50 meters (5atm)
Sapphire crystal on the top and on the back
Crown with single push-button
Available in pink (4N18) or white gold (18 carat)

Engine-turned dial by hand, piece by piece
Available in Silver, Black or Champagne gold dial version
Blued steel or gold plated hands
Central hands indicating hours, minutes and sweep seconds of chronograph, 60 minutes counter and small second hand

Genuine alligator (also on the back), hand stitching
Traditional tongue buckle or double folder deployment buckle in gold (optional)


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